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Kroenke K, Spitzer RL, Williams JB, Löwe B (2010). "The Patient Health Questionnaire Somatic, Anxiety, and Depressive Symptom Scales: a systematic review". General Hospital Psychiatry. 32 (4): 345–359. doi:10.1016/j.genhosppsych.2010.03.006. PMID20633738. S2CID34713999.
Smarr KL, Keefer AL (November 2011). "Measures of depression and depressive symptoms: Beck Depression Inventory-II (BDI-II), Center for Epidemiologic Studies Depression Scale (CES-D), Geriatric Depression Scale (GDS), Hospital Anxiety and Depression Scale (HADS), and Patient Health Questionnaire-9 (PHQ-9)". Arthritis Care & Research. 63 (Suppl 11): S454–S466. doi:10.1002/acr.20556. PMID22588766. S2CID9086062.
Kroenke K, Spitzer RL, Williams JB, Löwe B (2010). "The Patient Health Questionnaire Somatic, Anxiety, and Depressive Symptom Scales: a systematic review". General Hospital Psychiatry. 32 (4): 345–359. doi:10.1016/j.genhosppsych.2010.03.006. PMID20633738. S2CID34713999.